I have avoided ENB so far. More that I want everything else working before I worry too much about eye candy.
Things so far that I have found useful.
This is the default. Changing this to 0.800 seems to clean up the shadows around a person's neck.
This is the default that my system generates.
With a little tuning.
iShadowMapResolution = 4096
Bumping this to the next higher setting dropped my FPS for my test scene from 54 to 26. Cost is a bit too high.
It helped to remove some of the blockyness of the ground shadows.
Thanks for the links phazer11 and Sydney. Very useful information.
Hopefully I can configure something that I can play and like and a set for picture book mode.